OFFSET
1,3
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..90 (calculated using Kim Walisch's primecount)
MAPLE
with(numtheory): with(combinat): p:=numbpart: P:=ithprime:
a:= n-> pi(phi(p(P(n)))):
seq(a(n), n=1..20);
MATHEMATICA
a[n_] := PrimePi @ EulerPhi @ PartitionsP @ Prime @ n;
Table[a[n], {n, 1, 30}] (* Jean-François Alcover, Mar 25 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Mar 14 2015
EXTENSIONS
a(31)-a(37) from Amiram Eldar, Sep 03 2024
STATUS
approved